can it also mean "what day is it?"
This usually means “What date is it?”
며칠 means "how many days". 무슨 날 이예요 means "what day is it?
Wouldn't that refer to the days of the week?
I'm not a native English speaker, but is "how many days is it" really a correct translation? I have never heard this used by anyone.
You could say this naturally as a question when someone tells you they're going to participate in a multi day event, like a a race across the world or something
I put how many days are there? I reported that my answer should also be correct.
Papago translates this as "What's the date?"
I thought this means "what date is today? How many days is 며칠 걸려요?